datum_max_float8 datum_max_int32 datum_max_text datum_min_float8 datum_min_int32 datum_min_text datum_sum_double2 datum_sum_double3 datum_sum_double4 datum_sum_float8 tbool_tand_transfn tbool_tor_transfn tcontseq_tagg_transfn tcontseq_transform_tagg tcontseq_transform_tcount tdiscseq_tagg_transfn tdiscseq_transform_tagg tdiscseq_transform_tcount temporal_extent_transfn temporal_tagg_combinefn temporal_tagg_finalfn temporal_tagg_transfn temporal_tagg_transform_transfn temporal_tcount_transfn temporal_transform_tagg temporal_transform_tcount tfloat_tmax_transfn tfloat_tmin_transfn tfloat_tsum_transfn tinstant_tagg tinstant_tagg_transfn tinstant_tavg_finalfn tinstant_transform_tcount tint_tmax_transfn tint_tmin_transfn tint_tsum_transfn tnumber_extent_transfn tnumber_tavg_finalfn tnumber_tavg_transfn tnumberinst_transform_tavg tsequence_tagg tsequence_tagg1 tsequence_tavg_finalfn tsequenceset_tagg_transfn tsequenceset_transform_tagg tsequenceset_transform_tcount ttext_tmax_transfn ttext_tmin_transfn

datum_sum_double2() Datum datum_sum_double2 ( Datum  l, Datum  r  ) Return the sum of the two arguments.